The Mighty Hoop is a strong magnetic hoop, which can be used on almost any embroidery machine. There is no need to adjust the outer ring of the hoop, because it holds the garment with magnetic force, and automatically adjusts for different thicknesses. Mighty Hoops reduce hoop burn, and stress on arms and wrists. You can hoop the impossible with Mighty Hoops, even Carhartt! Mighty Hoops are the latest invention patented by Midwest Products Inc., the innovators of the HoopMaster. The HoopMaster is the best-selling commercial embroidery hooping system in the world. Its patented features make it the easiest, fastest, and most consistent hooping system available in the industry. We recommend using the HoopMaster with Mighty Hoops for the ultimate hooping experience!